John Glover Roberts Jr., born in 1955, is the Chief Justice of the United States Supreme Court, appointed in 2005 by President George W. Bush. A Harvard-educated lawyer, he previously served in government and on the U.S. Court of Appeals. Known as a pragmatic conservative, Roberts has guided the Court through landmark rulings on healthcare, voting rights, and same-sex marriage, often casting decisive votes that highlight his role as a stabilizing figure in American law.